A test system and method for measuring dynamic stress on the surface of an impingement turbine
A test system, dynamic stress technology, applied in the direction of impact engine, hydroelectric power, machine/engine, etc., to achieve the effect of dynamic stress measurement
Active Publication Date: 2021-07-27
HOHAI UNIV
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Problems solved by technology
[0004] The invention provides a test system and method for measuring the dynamic stress on the surface of an impact turbine, which solves the problems disclosed in the background technology
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[0028] The present invention will be further described below in conjunction with the accompanying drawings. The following examples are only used to illustrate the technical solution of the present invention more clearly, but not to limit the protection scope of the present invention.
[0029] Such as figure 1 As shown, a test system for measuring dynamic stress on the surface of a Pelton turbine includes a support 1 , a turntable 9 , a first column 4 , a second column 5 , a strain gauge 3 and a nozzle 6 .
[0030] The turntable 9 has a circular structure, and the turntable 9 is installed on the bracket 1 through the rotation of the rotating shaft 2. A group of bucket blades 7 is fixed on the outer edge of the turntable 9. This group includes three bucket blades 7, and the distance between adjacent bucket blades 7 is equal, such as figure 2 Strain gauges 12 are pasted at the position of the maximum dynamic stress of the bucket blades 7, anti-collision bars 11 are fixed on the...
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The invention discloses a test system for measuring the surface dynamic stress of an impact water turbine, which comprises a support, a turntable, a first column, a second column, a strain gauge and a nozzle; Strain gauges are installed at the position of the maximum dynamic stress of the bucket blades, and anti-collision bars are installed on the outer edge of the turntable on both sides of the group of bucket blades; the first column and the second column are arranged on the bracket, and the first column and the second column are respectively Located on the outside of the two anti-collision bars; the stress gauge is set on the bracket, and the strain gauge is connected to the strain gauge through a wire; the nozzle is set on the bracket, the outlet of the nozzle faces the bucket blade, and the nozzle shoots water toward the bucket blade. Corresponding methods are disclosed at the same time. The invention measures the dynamic stress on the surface of the impact water turbine by means of test simulation, and the water flow injected from the nozzle drives the bucket blades to rotate, thereby realizing the measurement of the dynamic stress and providing a basis for the structure and parameter optimization of the water turbine.
Description
technical field [0001] The invention relates to a test system and method for measuring the dynamic stress on the surface of an impact water turbine, belonging to the field of dynamic stress measurement. Background technique [0002] In addition to being damaged by cavitation erosion and sand wear, bucket blades of impact turbines are usually subjected to hydraulic excitation such as Karman vortex, tailwater vortex, and periodic shedding. When these alternating loads and static stress act together, It is easy to reach the fatigue limit of the bucket material, causing vibration, noise and fatigue fracture of the bucket. Therefore, a stress meter that rotates with the shaft is often installed on the Pelton turbine, and the strength and stiffness of the bucket blades can be understood and controlled through the real-time measured dynamic stress data, so as to ensure the stability and safety of the Pelton turbine currently in operation. [0003] This traditional measurement meth...
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IPC IPC(8): F03B11/00F03B1/02F03B1/04
CPCF03B1/02F03B1/04F03B11/008Y02E10/20
Inventor 葛新峰孙洁沈鑫伟宁望望张敬徐挺武恩全宋攀登
Owner HOHAI UNIV